Reason it's on The Best Sites:

Can I Use is useful for web developers who are using newer features. If you want to find out what browsers support the feature you want to use, Can I Use will be useful.

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Can I Use?'s traffic is ranked 21189 globally

Can I Use is a simple service for a somewhat complex problem. Web developers need to know what features are supported by certain browsers and Can I Use acts as a portal where they can easily find out what browsers support which features.

Type in a feature in the search box on the home page and you’ll be shown a list of browsers that are either green or red based on whether or not they support the feature you’re looking up. By default, Can I Use only shows browsers that have a high percentage of the total number of users globally. You can change this in their search settings to show more browsers.

A cool feature they have is the ability to import your own Google Analytics data so you can see your own website’s browsers information alongside the global percentages of which browsers people are using.